/* * diskspace.c * * Copyright (c) 2010-2017 Pacman Development Team <pacman-dev@archlinux.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <stdio.h> #include <errno.h> #if defined(HAVE_MNTENT_H) #include <mntent.h> #endif #if defined(HAVE_SYS_MNTTAB_H) #include <sys/mnttab.h> #endif #if defined(HAVE_SYS_STATVFS_H) #include <sys/statvfs.h> #endif #if defined(HAVE_SYS_PARAM_H) #include <sys/param.h> #endif #if defined(HAVE_SYS_MOUNT_H) #include <sys/mount.h> #endif #if defined(HAVE_SYS_UCRED_H) #include <sys/ucred.h> #endif #if defined(HAVE_SYS_TYPES_H) #include <sys/types.h> #endif /* libalpm */ #include "diskspace.h" #include "alpm_list.h" #include "util.h" #include "log.h" #include "trans.h" #include "handle.h" static int mount_point_cmp(const void *p1, const void *p2) { const alpm_mountpoint_t *mp1 = p1; const alpm_mountpoint_t *mp2 = p2; /* the negation will sort all mountpoints before their parent */ return -strcmp(mp1->mount_dir, mp2->mount_dir); } static void mount_point_list_free(alpm_list_t *mount_points) { alpm_list_t *i; for(i = mount_points; i; i = i->next) { alpm_mountpoint_t *data = i->data; FREE(data->mount_dir); } FREELIST(mount_points); } static int mount_point_load_fsinfo(alpm_handle_t *handle, alpm_mountpoint_t *mountpoint) { #if defined(HAVE_GETMNTENT) /* grab the filesystem usage */ if(statvfs(mountpoint->mount_dir, &(mountpoint->fsp)) != 0) { _alpm_log(handle, ALPM_LOG_WARNING, _("could not get filesystem information for %s: %s\n"), mountpoint->mount_dir, strerror(errno)); mountpoint->fsinfo_loaded = MOUNT_FSINFO_FAIL; return -1; } _alpm_log(handle, ALPM_LOG_DEBUG, "loading fsinfo for %s\n", mountpoint->mount_dir); mountpoint->read_only = mountpoint->fsp.f_flag & ST_RDONLY; mountpoint->fsinfo_loaded = MOUNT_FSINFO_LOADED; #else (void)handle; (void)mountpoint; #endif return 0; } static alpm_list_t *mount_point_list(alpm_handle_t *handle) { alpm_list_t *mount_points = NULL, *ptr; alpm_mountpoint_t *mp; #if defined(HAVE_GETMNTENT) && defined(HAVE_MNTENT_H) /* Linux */ struct mntent *mnt; FILE *fp; fp = setmntent(MOUNTED, "r"); if(fp == NULL) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not open file: %s: %s\n"), MOUNTED, strerror(errno)); return NULL; } while((mnt = getmntent(fp))) { CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); STRDUP(mp->mount_dir, mnt->mnt_dir, free(mp); RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); mp->mount_dir_len = strlen(mp->mount_dir); mount_points = alpm_list_add(mount_points, mp); } endmntent(fp); #elif defined(HAVE_GETMNTENT) && defined(HAVE_MNTTAB_H) /* Solaris, Illumos */ struct mnttab mnt; FILE *fp; int ret; fp = fopen("/etc/mnttab", "r"); if(fp == NULL) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not open file %s: %s\n"), "/etc/mnttab", strerror(errno)); return NULL; } while((ret = getmntent(fp, &mnt)) == 0) { CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); STRDUP(mp->mount_dir, mnt->mnt_mountp, free(mp); RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); mp->mount_dir_len = strlen(mp->mount_dir); mount_points = alpm_list_add(mount_points, mp); } /* -1 == EOF */ if(ret != -1) { _alpm_log(handle, ALPM_LOG_WARNING, _("could not get filesystem information\n")); } fclose(fp); #elif defined(HAVE_GETMNTINFO) /* FreeBSD (statfs), NetBSD (statvfs), OpenBSD (statfs), OS X (statfs) */ int entries; FSSTATSTYPE *fsp; entries = getmntinfo(&fsp, MNT_NOWAIT); if(entries < 0) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not get filesystem information\n")); return NULL; } for(; entries-- > 0; fsp++) { CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); STRDUP(mp->mount_dir, fsp->f_mntonname, free(mp); RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); mp->mount_dir_len = strlen(mp->mount_dir); memcpy(&(mp->fsp), fsp, sizeof(FSSTATSTYPE)); #if defined(HAVE_GETMNTINFO_STATVFS) && defined(HAVE_STRUCT_STATVFS_F_FLAG) mp->read_only = fsp->f_flag & ST_RDONLY; #elif defined(HAVE_GETMNTINFO_STATFS) && defined(HAVE_STRUCT_STATFS_F_FLAGS) mp->read_only = fsp->f_flags & MNT_RDONLY; #endif /* we don't support lazy loading on this platform */ mp->fsinfo_loaded = MOUNT_FSINFO_LOADED; mount_points = alpm_list_add(mount_points, mp); } #endif mount_points = alpm_list_msort(mount_points, alpm_list_count(mount_points), mount_point_cmp); for(ptr = mount_points; ptr != NULL; ptr = ptr->next) { mp = ptr->data; _alpm_log(handle, ALPM_LOG_DEBUG, "discovered mountpoint: %s\n", mp->mount_dir); } return mount_points; } static alpm_mountpoint_t *match_mount_point(const alpm_list_t *mount_points, const char *real_path) { const alpm_list_t *mp; for(mp = mount_points; mp != NULL; mp = mp->next) { alpm_mountpoint_t *data = mp->data; /* first, check if the prefix matches */ if(strncmp(data->mount_dir, real_path, data->mount_dir_len) == 0) { /* now, the hard work- a file like '/etc/myconfig' shouldn't map to a * mountpoint '/e', but only '/etc'. If the mountpoint ends in a trailing * slash, we know we didn't have a mismatch, otherwise we have to do some * more sanity checks. */ if(data->mount_dir[data->mount_dir_len - 1] == '/') { return data; } else if(strlen(real_path) >= data->mount_dir_len) { const char next = real_path[data->mount_dir_len]; if(next == '/' || next == '\0') { return data; } } } } /* should not get here... */ return NULL; } static int calculate_removed_size(alpm_handle_t *handle, const alpm_list_t *mount_points, alpm_pkg_t *pkg) { size_t i; alpm_filelist_t *filelist = alpm_pkg_get_files(pkg); if(!filelist->count) { return 0; } for(i = 0; i < filelist->count; i++) { const alpm_file_t *file = filelist->files + i; alpm_mountpoint_t *mp; struct stat st; char path[PATH_MAX]; blkcnt_t remove_size; const char *filename = file->name; snprintf(path, PATH_MAX, "%s%s", handle->root, filename); if(llstat(path, &st) == -1) { if(alpm_option_match_noextract(handle, filename)) { _alpm_log(handle, ALPM_LOG_WARNING, _("could not get file information for %s\n"), filename); } continue; } /* skip directories and symlinks to be consistent with libarchive that * reports them to be zero size */ if(S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode)) { continue; } mp = match_mount_point(mount_points, path); if(mp == NULL) { _alpm_log(handle, ALPM_LOG_WARNING, _("could not determine mount point for file %s\n"), filename); continue; } /* don't check a mount that we know we can't stat */ if(mp && mp->fsinfo_loaded == MOUNT_FSINFO_FAIL) { continue; } /* lazy load filesystem info */ if(mp->fsinfo_loaded == MOUNT_FSINFO_UNLOADED) { if(mount_point_load_fsinfo(handle, mp) < 0) { continue; } } /* the addition of (divisor - 1) performs ceil() with integer division */ remove_size = (st.st_size + mp->fsp.f_bsize - 1) / mp->fsp.f_bsize; mp->blocks_needed -= remove_size; mp->used |= USED_REMOVE; } return 0; } static int calculate_installed_size(alpm_handle_t *handle, const alpm_list_t *mount_points, alpm_pkg_t *pkg) { size_t i; alpm_filelist_t *filelist = alpm_pkg_get_files(pkg); if(!filelist->count) { return 0; } for(i = 0; i < filelist->count; i++) { const alpm_file_t *file = filelist->files + i; alpm_mountpoint_t *mp; char path[PATH_MAX]; blkcnt_t install_size; const char *filename = file->name; /* libarchive reports these as zero size anyways */ /* NOTE: if we do start accounting for directory size, a dir matching a * mountpoint needs to be attributed to the parent, not the mountpoint. */ if(S_ISDIR(file->mode) || S_ISLNK(file->mode)) { continue; } /* approximate space requirements for db entries */ if(filename[0] == '.') { filename = handle->dbpath; } snprintf(path, PATH_MAX, "%s%s", handle->root, filename); mp = match_mount_point(mount_points, path); if(mp == NULL) { _alpm_log(handle, ALPM_LOG_WARNING, _("could not determine mount point for file %s\n"), filename); continue; } /* don't check a mount that we know we can't stat */ if(mp && mp->fsinfo_loaded == MOUNT_FSINFO_FAIL) { continue; } /* lazy load filesystem info */ if(mp->fsinfo_loaded == MOUNT_FSINFO_UNLOADED) { if(mount_point_load_fsinfo(handle, mp) < 0) { continue; } } /* the addition of (divisor - 1) performs ceil() with integer division */ install_size = (file->size + mp->fsp.f_bsize - 1) / mp->fsp.f_bsize; mp->blocks_needed += install_size; mp->used |= USED_INSTALL; } return 0; } static int check_mountpoint(alpm_handle_t *handle, alpm_mountpoint_t *mp) { /* cushion is roughly min(5% capacity, 20MiB) */ fsblkcnt_t fivepc = (mp->fsp.f_blocks / 20) + 1; fsblkcnt_t twentymb = (20 * 1024 * 1024 / mp->fsp.f_bsize) + 1; fsblkcnt_t cushion = fivepc < twentymb ? fivepc : twentymb; blkcnt_t needed = mp->max_blocks_needed + cushion; _alpm_log(handle, ALPM_LOG_DEBUG, "partition %s, needed %jd, cushion %ju, free %ju\n", mp->mount_dir, (intmax_t)mp->max_blocks_needed, (uintmax_t)cushion, (uintmax_t)mp->fsp.f_bavail); if(needed >= 0 && (fsblkcnt_t)needed > mp->fsp.f_bavail) { _alpm_log(handle, ALPM_LOG_ERROR, _("Partition %s too full: %jd blocks needed, %ju blocks free\n"), mp->mount_dir, (intmax_t)needed, (uintmax_t)mp->fsp.f_bavail); return 1; } return 0; } int _alpm_check_downloadspace(alpm_handle_t *handle, const char *cachedir, size_t num_files, off_t *file_sizes) { alpm_list_t *mount_points; alpm_mountpoint_t *cachedir_mp; char resolved_cachedir[PATH_MAX]; size_t j; int error = 0; /* resolve the cachedir path to ensure we check the right mountpoint. We * handle failures silently, and continue to use the possibly unresolved * path. */ if(realpath(cachedir, resolved_cachedir) != NULL) { cachedir = resolved_cachedir; } mount_points = mount_point_list(handle); if(mount_points == NULL) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not determine filesystem mount points\n")); return -1; } cachedir_mp = match_mount_point(mount_points, cachedir); if(cachedir_mp == NULL) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not determine cachedir mount point %s\n"), cachedir); error = 1; goto finish; } if(cachedir_mp->fsinfo_loaded == MOUNT_FSINFO_UNLOADED) { if(mount_point_load_fsinfo(handle, cachedir_mp)) { error = 1; goto finish; } } /* there's no need to check for a R/O mounted filesystem here, as * _alpm_filecache_setup will never give us a non-writable directory */ /* round up the size of each file to the nearest block and accumulate */ for(j = 0; j < num_files; j++) { cachedir_mp->max_blocks_needed += (file_sizes[j] + cachedir_mp->fsp.f_bsize + 1) / cachedir_mp->fsp.f_bsize; } if(check_mountpoint(handle, cachedir_mp)) { error = 1; } finish: mount_point_list_free(mount_points); if(error) { RET_ERR(handle, ALPM_ERR_DISK_SPACE, -1); } return 0; } int _alpm_check_diskspace(alpm_handle_t *handle) { alpm_list_t *mount_points, *i; alpm_mountpoint_t *root_mp; size_t replaces = 0, current = 0, numtargs; int error = 0; alpm_list_t *targ; alpm_trans_t *trans = handle->trans; numtargs = alpm_list_count(trans->add); mount_points = mount_point_list(handle); if(mount_points == NULL) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not determine filesystem mount points\n")); return -1; } root_mp = match_mount_point(mount_points, handle->root); if(root_mp == NULL) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not determine root mount point %s\n"), handle->root); error = 1; goto finish; } replaces = alpm_list_count(trans->remove); if(replaces) { numtargs += replaces; for(targ = trans->remove; targ; targ = targ->next, current++) { alpm_pkg_t *local_pkg; int percent = (current * 100) / numtargs; PROGRESS(handle, ALPM_PROGRESS_DISKSPACE_START, "", percent, numtargs, current); local_pkg = targ->data; calculate_removed_size(handle, mount_points, local_pkg); } } for(targ = trans->add; targ; targ = targ->next, current++) { alpm_pkg_t *pkg, *local_pkg; int percent = (current * 100) / numtargs; PROGRESS(handle, ALPM_PROGRESS_DISKSPACE_START, "", percent, numtargs, current); pkg = targ->data; /* is this package already installed? */ local_pkg = _alpm_db_get_pkgfromcache(handle->db_local, pkg->name); if(local_pkg) { calculate_removed_size(handle, mount_points, local_pkg); } calculate_installed_size(handle, mount_points, pkg); for(i = mount_points; i; i = i->next) { alpm_mountpoint_t *data = i->data; if(data->blocks_needed > data->max_blocks_needed) { data->max_blocks_needed = data->blocks_needed; } } } PROGRESS(handle, ALPM_PROGRESS_DISKSPACE_START, "", 100, numtargs, current); for(i = mount_points; i; i = i->next) { alpm_mountpoint_t *data = i->data; if(data->used && data->read_only) { _alpm_log(handle, ALPM_LOG_ERROR, _("Partition %s is mounted read only\n"), data->mount_dir); error = 1; } else if(data->used & USED_INSTALL && check_mountpoint(handle, data)) { error = 1; } } finish: mount_point_list_free(mount_points); if(error) { RET_ERR(handle, ALPM_ERR_DISK_SPACE, -1); } return 0; } /* vim: set noet: */